Knife sharpener



Nv. 15, 1949 w. A. swlGART KNIFE SHARPENER Filed June l5, 1947 INVENTOR.mit/@MWA im' am bril/:dgl IF Pl.

a l y Patented Nov. 15,` 1949 UNITED` STATES PATlf'lllll'v KNIFESHARPENER Walter A... Swigarti. Qhiceo, 1.11@ Application June. L3,1947,..Serial No.. 754:2324.

' I (el. .i1-2.0.5)

4z Claims. 1

This invention relatesl to certain newand use` ful improvements in knifeSharpeners.

More particularly, the invention relates to asharpening device forsharpening the cutting edges of the bladesl of a paper cutter'andtrimming machine. As such anl invention has for its principal object theprovision of an improved construction of this character. it, will behighly enicient in use andA economical, in manufacture.

As the knives of a paper cutting and trimmingr apparatus usually are ofjsubstantial weight which makes it difficult to handle the. blade forsharpening purposes. I have devised a device. which.. may be. supportedupon the blade with the sharpening elements at a proper inclinationwith. respect to. the beveled cutting edge portion oi the blade withease and. with. thegreatestd'egree. of. eioienoy during the sharpeningoperation and the. minimum degree of danger to the operator` Anotherobject Qt my invention resides in the manner of holding the sharpeningelements within a holder and forlocatingl these elements properly withrespect to the beveled cutting edge of the blade; f

Other objects will appear hereinafter.

The invention. consists in the navel combination and arrangement ofparts. to be hereinafter described and claimed.

The. invention will be best understood; by reference to the accompanyingdrawings showing the preferred form of construction, and in which:

Fig. 1 is a perspective view of the invention in applied position upon ablade;

Fig. 2 is a sectional detail View taken substantially on line 2-2 ofFig. 3; and

Fig. 3 is a view of the blade engaging surface of my sharpening device.

The several objects of my invention are accomplished by the preferredform of construction shown in the accompanying drawings and in which aholder is indicated at I0. This holder includes a back plate I I fromwhich extend integral side anges I2 and intermediate flanges I3. Theflanges I2 together with the flanges I3 provide with the back plate IIseparate channels I4 within which are adapted to be positioned thesharpening elements I5. These sharpening elements I5 may be formed ofany approved material and are preferably whetstones.

The 4sharpening elements are yieldably held within the channels I4 bymeans of suitable spring leaves I6 disposed between the sharpeningelements and the flanges I3 and of a sufficient resiliency to yieldablyurge the sharpening elements I5 against the anges I2.

o the holder I-Il between the flanges I3.

These sharpening elements arereleasably latched' in the channels I4 bymeans of a retainer plate I1 having extending therefrom a binding screwI8 projecting through a slot I9 formed-in Onthis binderI screw is alatch nut 20 serving to latch the retainer plate Il in an adjustableposition with respect to the sharpening elements- I-5.

This retainer plate has an edge portion 2-I provided with asubstantially nat outer surface 2'2l which is adapted to engage the fiatsurface 23'of the knife blade 24 beingsharpenedA A guiding head isindicated at 25v and comprises a body'portion 2.6 positioned in a slot2T formed in the back plate I'I between. the. upper end portions o f theflanges I3. Secured to this` body 26 as at 28 is a plate 29 carrying anadjustable screw 30. This guiding head 25 is pivotally connected by apintle. pin 3l tothe 'anees l3.. The guiding head Z5. includesa. socket32. in which is. adapted to be mounted a guide block 33 0.1: a whetstone(notshownh the. latter being of the same size. and shape. asv the guidevblock 33 whereby it may be substituted for the; block 3.3. for reasons.hereinafter set forth. l

This block. 33. is clamped within the socket 32 by means. of. a faceplate 32 secured to the guiding head 25 by means of screw bolts 34...

Thev guide. block 33 has. a. portion thereof. re moved to. provide anopen area 35. whereby when: the Sharpener is mounted upon the blade 24the tip edge 36 of the cutting edge portion of the blade will bedisposed at some point Within the area 35 free from contact with theblock 33.

To complete the invention there may be engraved, stamped, or impressedupon the plate II a scale 3B', the lines of which may be numbered as at31 and these lines may be spaced a predetermined distance aparat so asto locate the flat surface 22 in close position with respect to thepoint of merger between the at surface 23 and the beveled edge portion23' of the blade 24, it being pointed out that this bevel 23 varies indifferent types of cutter blades.

In use after the retainer plate I'I has been properly adjusted forproper engagement with the flat surface 23 of the blade 24, the holderis mounted upon the blade 24 with the guide block 33 engaging the blade24 in the manner shown in Fig. 2 and with the whetstones I5 iiatlyengaging the beveled edge 23'. By grasping the holder I0 between theiingers and the thumb the sharpener may be readily and convenientlyreciprocated over the cutting edge portion of the blade 2-4 until aproper cutting edge has been restored 3 to the blade 24. Should thewhetstones become Worn they may be removed from their seated positionsin the channels I4 and reversed or replaced by new whetstones.

After the sharpening operation has taken place there will be found toexist upon the cutting edge 36 minute burrs which should be removed.This is accomplished by removing the guide block 33 and replacing thesame with a whetstone or the like andY then reciprocating the Yholderrelative to the blade until the burrs Ahave been removed.

It will be apparent that my improved knife Sharpener can be operatedwith the minimum degree of effort on the part of the operator with theminimum degree of possible injury to the operator, the latter resultingfrom the fact that the sharpening device by virtue of its guiding headpositioned upon the blade cannot be readily displaced by accident orotherwise during the sharpening operation.

The sharpening elements are arranged in the holder in a manner such asto permit ready removal thereof for repair or replacement.

I-t will be also apparent that the retainer plate l1 in its function toproperly position the sharpening elements with respect to the beveledportion 23 of the blade 24 serves to properly guide these sharpeningelements at a proper inclination with respect to the blade 24 whereby anaccurate beveled cutting edge will be maintained.

While I have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariation and modification without departing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modications as come within the scope of the appendedclaims.

Having thus described my invention, what I claim as new and desire toprotect by Letters Patent is:

1. A knife Sharpener comprising a holder, sharpening elements carried bythe holder, means for removably mounting the sharpening `elements withinthe holder and including an element adapted to engage the at side ofaknife blade for positioning the sharpening elements upon the bevelededge portion of the cutting edge of said knife blade, and a guide headpivotally carried bythe holder and having means adapted to engage thefiat surface of the blade opposite the beveled edge of the knife.

2. A knife Sharpener comprising a holder, sharpening elements carried bythe holder, means for removably mounting the sharpening elements withinthe holder and for positioning the sharpening elements upon the bevelededge portion of the cutting edge of a knife blade, a guide headpivot-,ally carried by the holder and having means adapted to engage theflat surface of the blade opposite the beveled edge of the knife, andmeans for adjusting said guide head relative to said blade.

.3. A knife sharpener comprising a holder, sharpening elements carriedby the holder, means for removably mounting the sharpening elementsWithin the holder and for positioning the sharpening elements upon thebeveled edge portion of the cutting edge of a knife blade, a guide headpivotally carried by the'holder and having means adapted to engage theilat surface of the blade opposite the beveled edge of the knife, saidretainer plate having means for adjustment relative Ito said sharpeningelements, and means for adjusting said guide head relative to saidblade.

4. A knife Sharpener comprising a holder providing a channel, a guideblock pivotally carried by said holder, a sharpening element mounted insaid channel, a wall of said holder providing an elongated slot, aretainer bar extending transversely of the element, a screw extendingthrough the slot and bearing upon said wall and having connection withthe bar to draw the bar into clamping engagement with the element toclamp said element in said channel, said bar and said guide block havingportions engaging a knife on opposite sides thereof with the elementbearing upon an edge of the knife to be sharpened to guide movement ofthe holder relative to said knife edge.

WALTER A. SWIGART.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

